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Native Plant Trust: Go Botany Discover thousands of New England plants

Mentha aquatica — water mint

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New England distribution

Adapted from BONAP data

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North America distribution

Adapted from BONAP data

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Facts

Water mint is a non-native mint with a strong smell and inflorescences with distinctive ball-shaped clusters of pale violet flowers.

Habitat

Anthropogenic (man-made or disturbed habitats)

Characteristics

Habitat
terrestrial
New England state
  • Connecticut
  • Maine
  • Massachusetts
  • Rhode Island
Flower petal color
  • blue to purple
  • pink to red
  • white
Leaf type
the leaves are simple (lobed or unlobed but not separated into leaflets)
Leaf arrangement
opposite: there are two leaves per node along the stem
Leaf blade edges
the edge of the leaf blade has teeth
Flower symmetry
  • there are two or more ways to evenly divide the flower (the flower is radially symmetrical)
  • there is only one way to evenly divide the flower (the flower is bilaterally symmetrical)
Number of sepals, petals or tepals
  • there are five petals, sepals, or tepals in the flower
  • there are four petals, sepals, or tepals in the flower
Fusion of sepals and petals
the petals or the sepals are fused into a cup or tube
Stamen number
4
Stem nodes swollen
the stem is not swollen at the nodes
Fruit type (general)
the fruit is dry but does not split open when ripe
Show all characteristics

  • Clonal plantlets

    Bulbils
    the plant does not appear to have bulbils
    Bulblets replace flowers
    there are no bulblets where the flowers are located

  • Flowers

    Anther color
    there is a noticeable pink, reddish or purplish tint to the anthers
    Anther opening
    the anthers have narrow slits or furrows that run lengthwise along the anthers
    Calyx symmetry
    there are two or more ways to evenly divide the calyx (the calyx is radially symmetrical)
    Carpels fused
    the carpels are fused to one another
    Cleistogamous flowers
    there are no cleistogamous flowers on the plan
    Corolla palate
    no
    Corona lobe length
    0 mm
    Epicalyx
    the flower does not have an epicalyx
    Epicalyx number of parts
    0
    Filament surface
    the filament is smooth, with no hairs or scales
    Flower description
    the flower has a superior ovary, and lacks a hypanthium
    Flower petal color
    • blue to purple
    • pink to red
    • white
    Flower reproductive parts
    • the flower has both pollen- and seed-producing parts
    • the flower has either only pollen- or only seed-producing parts
    Flower symmetry
    • there are two or more ways to evenly divide the flower (the flower is radially symmetrical)
    • there is only one way to evenly divide the flower (the flower is bilaterally symmetrical)
    Flowers sunken into stem
    no
    Form of style
    the style is lobed at the tip, and unbranched
    Fused stamen clusters
    NA
    Fusion of sepals and petals
    the petals or the sepals are fused into a cup or tube
    Hairs on flower stalk
    the flower stalk has hairs on it
    Horns in hoods (Asclepias)
    NA
    Hypanthium
    the flower does not have a hypanthium
    Hypanthium length
    0 mm
    Inflorescence length
    15–30 mm
    Inflorescence one-sided
    the flowers are arrayed in a spiral around the inflorescence axis or branches, or occur singly, or in several ranks
    Inflorescence width
    12–20 mm
    Inner tepals (Rumex)
    NA
    Interior flower disk
    the flower has an interior disc
    Length of peduncle
    2–10 mm
    Marks on petals
    there are no noticeable marks on the petals
    Nectar spur
    the flower has no nectar spurs
    Number of branches in umbel
    0
    Number of carpels
    2
    Number of sepals, petals or tepals
    • there are five petals, sepals, or tepals in the flower
    • there are four petals, sepals, or tepals in the flower
    Number of styles
    1
    Ovary position
    the ovary is above the point of petal and/or sepal attachment
    Perianth shape
    the perianth is funnelform (funnel-shaped)
    Petal and sepal arrangement
    the flower includes two cycles of petal- or sepal-like structures
    Petal and sepal colors
    • blue to purple
    • pink to red
    • white
    Petal appearance
    the petals are thin and delicate, and pigmented (colored other than green or brown)
    Petal folds or pleats
    the petals of the flower do not have folds or plaits
    Petal hairs (Viola)
    NA
    Petal number
    4
    Petal tips (Cuscuta)
    NA
    Raceme attachment (Veronica)
    NA
    Scales inside corolla
    no
    Sepal and petal color
    the sepals are different from the petals
    Sepal appearance
    the sepals are green or brown, and leaf-like in texture
    Sepal appendages
    the sepals do not have appendages on them
    Sepal appendages (Oenothera)
    NA
    Sepal color
    • blue to purple
    • green to brown
    • pink to red
    Sepal length
    2.5–4 mm
    Sepal number
    5
    Sepal shape
    • the sepal outline is roughly triangular
    • the sepal outline is subulate (narrowly tapering from the base to the apex; awl-shaped)
    Sepal uniformity
    all the sepals are about the same size
    Sepals fused only to sepals
    the sepals are fused to each other (not other flower parts), at least near their bases
    Spur length
    0 mm
    Spur number
    NA
    Stamen attachment
    the stamens are not attached to the petals or tepals
    Stamen morphology
    • the stamens within a cycle differ in length or width
    • the stamens within each cycle are the same
    Stamen number
    4
    Stamen relative length
    • anything
    • anything
    Stamens fused
    the stamens are not attached to one another
    Staminodes
    there are no staminodes on the flower
    Umbel flower reproductive parts
    NA
    Upper lip of bilabiate corolla
    • NA
    • the upper lip of the bilabiate corolla has one lobe
    • the upper lip of the bilabiate corolla has two lobes

  • Fruits or seeds

    Achene relative orientation
    NA
    Achene shape
    NA
    Achene surface (Polygonum)
    NA
    Achene type
    NA
    Berry color
    NA
    Capsule color (Viola)
    NA
    Capsule ribs
    NA
    Capsule splitting
    NA
    Fruit (pyxis) dehiscence
    NA
    Fruit beak length
    0 mm
    Fruit features (Brassicaceae)
    NA
    Fruit locules
    four
    Fruit type (general)
    the fruit is dry but does not split open when ripe
    Fruit type (specific)
    the fruit is a schizocarp (when dry it splits into sections, each holding one or more seeds)
    Legumes (Fabaceae)
    NA
    Mericarp segment shape (Desmodium)
    NA
    Other markings on berry
    NA
    Ovary stipe
    the ovary or fruit does not have a stipe
    Placenta arrangement
    the plant has axile placentation, in which the ovules are attached where the septa of a compound ovary are united, usually on the central axis, or to the septa themselves
    Rows of seeds in fruit (Brassicaceae)
    NA
    Schizocarpic fruit compression
    the fruit is not flattened
    Schizocarpic fruit segments
    4
    Seed number
    2
    Septum in fruit (Brassicaceae)
    NA
    Wings on fruit
    the fruit does not have wings on it
    prickles on fruits
    the fruits do not have thorn-like defensive structures

  • Glands or sap

    Glands on leaf blade
    the leaf blades have glandular dots or scales
    Sap
    the sap is clear and watery
    Sap color
    the sap is clear

  • Growth form

    Growth form
    the plant is an herb (it has self-supporting stems)
    Lifespan
    the plant lives more than two years
    Parasitism
    the plant is not parasitic
    Plant color
    the leaves or young stems of the plant are green
    Spines on plant
    the plant has no spines
    Underground organs
    the plant has a rhizome (a horizontal underground stem with roots growing from it)

  • Leaves

    Bracteole number (Apiaceae)
    0
    Bracts in plantain (Plantago)
    NA
    Final leaf segment length (compound lvs only)
    0 mm
    Final leaf segment length to width ratio (compound lvs only)
    0
    Final leaf segment width (compound lvs only)
    0 mm
    Floral bract texture
    the floral bracts are green, with a leaf-like texture
    Floral bracts
    the flower has one or more bracts associated with it
    Hooked hairs on underside of leaf
    no
    Inflated hairs on leaf
    the leaf blade does not have inflated hairs on it
    Leaf arrangement
    opposite: there are two leaves per node along the stem
    Leaf blade base
    the leaf has a distinct leaf stalk (petiole)
    Leaf blade base shape
    the base of the leaf blade is truncate (ends abruptly in a more or less straight line as though cut off)
    Leaf blade base symmetry
    the leaf blade base is symmetrical
    Leaf blade bloom
    the underside of the leaf has no noticeable bloom
    Leaf blade edges
    the edge of the leaf blade has teeth
    Leaf blade flatness
    the leaf is flat (planar) at the edges
    Leaf blade length
    15–90 mm
    Leaf blade primary vein pattern
    the secondary veins branch off at intervals from the primary vein
    Leaf blade shape
    • the leaf blade is lanceolate (lance-shaped; widest below the middle and tapering at both ends)
    • the leaf blade is ovate (widest below the middle and broadly tapering at both ends)
    Leaf blade surface colors
    the upper side of the leaf blade is relatively uniform in color
    Leaf blade texture
    the leaf blade is herbaceous (has a leafy texture)
    Leaf blade vein pattern
    the major veins of the leaf blade branch, but do not rejoin
    Leaf blade veins
    the leaf blade has one main vein running from the base towards the tip (it may or may not have secondary veins)
    Leaf blade width
    10–40 mm
    Leaf duration
    the leaves drop off in winter (or they whither but persist on the plant)
    Leaf form
    the leaves are green, with an expanded blade and a leaf-like texture
    Leaf shiny
    the upper side of the leaf is dull or slightly shiny
    Leaf spines
    there are no spines on the leaf edges
    Leaf stalk
    the leaves have leaf stalks
    Leaf stalk attachment to leaf
    the petiole attaches at the basal margin of the leaf blade
    Leaf teeth and lobes
    the leaf blade margin has forward-pointing teeth
    Leaf type
    the leaves are simple (lobed or unlobed but not separated into leaflets)
    Leaf variation
    the leaves are nearly similar in size, prominence of teeth, and length of stalks throughout the stem
    Leaflet number
    0
    Leaflet petiolules
    NA
    Leaves per node
    there are two leaves per node along the stem
    Pinnately compound leaf type
    NA
    Specific leaf type
    the leaves are simple (lobed or unlobed but not separated into leaflets)
    Stipels
    NA
    Stipule edges
    NA
    Stipule features
    NA
    Stipule fused to leaf stalk
    NA
    Stipule length
    0 mm
    Stipule shape
    NA
    Stipules
    there are no stipules on the plant

  • Place

    Habitat
    terrestrial
    New England state
    • Connecticut
    • Maine
    • Massachusetts
    • Rhode Island
    Specific habitat
    man-made or disturbed habitats

  • Scent

    Plant odor
    the plant has a pleasant smell, for example anise, fruit, mint or resin

  • Stem, shoot, branch

    Branched tendrils
    NA
    Direction of stem hairs
    the hairs are pressed flat against the plant, pointing towards the plant's tip
    Flowering stem cross-section
    the flowering stem is roughly square
    Hair between stem nodes
    • the stem has hairs between the nodes
    • the stem has no hairs between the nodes
    Hairs between stem nodes
    at least some of the hairs on the stem are tangled, matted or woolly
    Hooked hairs on stem between nodes
    no
    Leaves on stem
    there is at least one full leaf above the base of the flowering stem
    Plant height
    10–90 cm
    Stem bloom
    there is no powdery or waxy film on the stem
    Stem hair distribution
    the hairs on the stem are distributed more of less uniformly
    Stem nodes swollen
    the stem is not swollen at the nodes
    Stem orientation
    the stems are upright or angled outwards
    Stem roughness between nodes
    the stem does not feel rough
    Stem succulence
    the stems are not succulent
    Tendril origin
    NA
    Tendrils
    the plant does not have tendrils
    Wings on stem
    the stem does not have wings on it

Wetland status

Occurs only in wetlands. (Wetland indicator code: OBL)

New England distribution and conservation status

Distribution

Connecticut
present
Maine
present
Massachusetts
present
New Hampshire
absent
Rhode Island
present
Vermont
present

Conservation status

Exact status definitions can vary from state to state. For details, please check with your state.

Massachusetts
unranked (S-rank: SNR)

Native to North America?

No

Sometimes confused with

Mentha spicata:
flowers in 4-19 somewhat closely spaced clusters mostly 40-100 mm tall (vs. M. aquatica, with flowers in 2 or 3 very closely spaced mostly 15-25 mm tall).

Synonyms

  • Mentha hirsuta Huds.
  • Mentha palustris P. Mill.

Family

Lamiaceae

Genus

Mentha

Notes on subspecies and varieties in New England

Mentha aquatica L. var. aquatica is known from CT, MA, ME. M. aquatica var. citrata (Ehrh.) Fresen. is known from CT, RI.

Help

From the dichotomous key of Flora Novae Angliae

1.  Mentha aquatica L. E

water mint. 1a. Mentha hirsuta Huds.; M. palustris P. Mill.; 1b. Mentha adspersa Moench; 
 M. citrata Ehrh.; M. ×‌piperita L. ssp. citrata (Ehrh.) Briq.; M. ×‌piperita L. var. citrata (Ehrh.) Rouy 
• CT, MA, ME, RI. Wet-mesic to hydric soil of roadsides and ditches.

1a.  Calyx pubescent; leaf blades usually pubescent, tending to be truncate at the base; 
fertile plants … 1a. M. aquatica var. aquatica

1b.  Calyx glabrous; leaf blades glabrous or nearly so, tending to be subcordate at the base; sterile plants (i.e., not producing fruit) … 1b. M. aquatica var. citrata (Ehrh.) Fresen.

Variety aquatica is known from CT, MA, ME. Variety citrata is known from CT, RI.

1×2. Mentha aquatica × Mentha arvensis → Mentha ×‌verticllata L. is a rare mint hybrid known from CT, VT. It is variable (like many mint hybrids), and the inflorescence varies from subverticillate to subcapitate. However, the verticillasters are most often subtended by bracts that ± resemble foliage leaves (at least the lower), so the hybrid is most often confused with species like M. arvensis and M. canadensis. It is normally a sterile, pubescent plant with a calyx 2.5–3.5 (–4) mm long.

1×5. Mentha aquatica × Mentha spicata → Mentha ×‌piperita L. is an infrequent mint hybrid known from CT, MA, ME, NH, RI, VT. It most closely resembles M. aquatica. The hybrid has a relatively dense, obloid inflorescence (25–) 45–80 ×12–20 mm, calyx with pubescence only on the lobes 
(i.e., the basal, connate portion is glabrous), usually glabrous pedicels, and the abaxial leaf blade surface is glabrous or with hairs along only the main veins (vs. basal, 
connate portion of the calyx pubescent, pedicels pubescent, and abaxial leaf blade surface sparsely to densely pubescent inM. aquatica var. aquatica). Further, M. ×‌piperita is sterile (vs. fertile in M. aquatica var. aquatica). From M. aquatica var. citrata it is separated by its pubescent calyx lobes and lanceolate to narrow-ovate leaf blades that are acute at the apex (vs. glabrous calyx lobes and ovate leaf blades that are obtuse 
at the apex in M. aquatica var. citrata).